BUG: The label files must be of type int
ENH: Added the save operation to the shell to be able to save a query withour rewriting it
ENH: Added a help command to the WMQL interactive shell
ENH: Corrected bug introduced in tract_math refactoring
BUG: Corrected bug in Str node processing
Merge branch 'master' of github.com:demianw/tract_querier
Merge branch 'master' into tornado_server

Conflicts:
	tract_querier/shell.py